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https://github.com/marcel-licence/esp32_basic_synth

ESP32 based simple synthesizer project
https://github.com/marcel-licence/esp32_basic_synth

arduino audio esp32 midi synthesizer

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ESP32 based simple synthesizer project

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esp32_basic_synth


ESP32 based DIY polyphonic MIDI synthesizer module Arduino project
  

 

  project picture


  link to the video



More infos:

- little quick start guide to get started with arduino synthesizer / music projects: https://youtu.be/ZNxGCB-d68g



> **⚠️ Note:** This project might be outdated and is no longer actively maintained. Development has continued in a new repository, which covers the **ESP32** and other boards as well. Please check out the latest version of the project here: **[ml_synth_basic_example](https://github.com/marcel-licence/ml_synth_basic_example)**



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The project has been tested on

- ESP32 Audio Kit V2.2 (using ESP32-A1S)

- ESP32 DEVKIT - DOIT (actually only supporting esp32\1.0.4 library)



# ESP32 Audio Kit V2.2

To compile set board to: ESP32 Dev Module

Ensure "#define ESP32_AUDIO_KIT" is set in config.h

IO22 will be used for MIDI in.



The ADC multiplexer can be used (other wise please remove #define ADC_TO_MIDI_ENABLED from config.h)

Connection of the ADC multiplexer:

- EN -> Ground

- S0 -> IO23

- S1 -> IO18

- S2 -> IO14

- S3 -> Ground

- Sig -> IO12



# ESP32 DEVKIT - DOIT

To compile set the board to: DOIT ESP32 DEVKIT V1

Ensure that "#define ESP32_AUDIO_KIT" has been removed from config.h



## Using a DAC

An external audio DAC is recommended for this setup:

- BCLK -> IO25

- WLCK -> IO27

- DOUT -> IO26



## Using no DAC

You can also get a sound without a DAC.

Add '#define I2S_NODAC' to config.h



The default output pin is IO22. Add a capacitor in series of the audio line (10µF for example)



## Using an ADC multiplexer

Connection of the ADC multiplexer:

- EN -> Ground

- S0 -> IO33

- S1 -> IO32

- S2 -> IO13

- S3 -> Ground

- Sig -> IO12

Here is the related video: https://youtu.be/l8GrNxElRkc



### ADC Mapping

The adc module has been only tested with the ESP32 Audio Kit V2.2.

In z_config.ino you can define your own mapping. Actually only 8 channels are read from the multiplexer.

The adc lookup is used to define a channel and cc per analog input (C0..C7).

By changing adc values a MIDI messages will generated internally.

It should be also mapped int the MIDI mapping.



# MIDI Mapping

A controller mapping can be found in z_config.ino.

You can define your own controller mapping if your controller does support CC messages.



## MIDI via USB

MIDI can be received via USB activating the MACRO "MIDI_VIA_USB_ENABLED" in config.h.



Default PIN Mapping is:

- CS: IO5

- INT: IO17 (not used)

- SCK: IO18

- MISO: IO19

- MOSI: IO23



For more information refer to the MIDI related project: https://github.com/marcel-licence/esp32_usb_midi

Using USB can be seen here: https://youtu.be/Mt3rT-SVZww



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If you have questions or ideas please feel free to use the discussion area!



Derived projects 

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MichaelPNolan added a phyicial interface, knobs etc. to make it standalone: https://github.com/MichaelPNolan/StandAloneSynth37key/tree/main/esp32_alone_synth



# Support & Donations



If you appreciate the work done on this project and would like to support its development, I would be more than happy to accept donations!



For more information on how to donate, please send an email to:



📧 **[email protected]**



Thank you for your support!